Split pulley.



No. 706,917. Patented Aug. l2, I902.

H'. W. FINCH.

SPLIT PULLEY.

(Ap'plication filed Dec. 19, 1901.) (No Model.)

7 ll lll UNITED STATES" Anni OFFICE IIOSEA W. FINCH, OF TACOMA, XVASIIINGTON.

SPLIT PULLEY.

SPECIFICATION formingpart of Letters Patent No. 706,917, dated August 12, 1902. Application filedDecemlier 19, 1901. Serial No. 86,565. (No model.)

To all whom it may concern.-

Be it known that I, HOSEA W. FINCH, a citizen of the United States, and a resident of. Tacoma, in the county ofPierce andrState of. Washington, have invented certain new and useful Improvementsin SplitPulleys,of which the following is a specification.

This invention is an improvement in split pulleys, and relates more especially to the provision of peculiar means for attaching the pulley to the shaft, whereby the turning of the shaft within the box or hub of the pulley will insure a positive engagement therewith and cause the pulleyto revolve with the shaft.

The invention contemplates a construction and arrangement of parts which will provide a shaft-grip for pulleys that shall be cheap and simple in construction, effective in operation, and strong and durable.

The in vention consists in the particular constrnction and combination of'the parts, all as will be hereinafter fully decribedyand more specifically set forth in the appended claim.

In the accompanying drawings, which form a part of this specification, and in which like letters of reference indicate like parts in the several views, Figure l is an elevation of a split pulley embodying my invention. Fig. 2 is an enlarged sectional View. Fig. 3 is a detail View of the wear-plate and part of the hub to which it is attached. Fig. at is a detail view of the wear-plate or casing.

Referring to said drawings, the letter a designates the rim of the pulley, a the'spokearms, and b b the box or hub, said box or hub beingadapted to receive the shaft 'upon' which the pulley is to be mounted.

In carrying out my invention the hub or box is made up of two parts, 21 and b, which fit together and are clamped between the spoke-arms alloy means of the bolts .9, the said spoke-ar'msbeing slightly-recessed, as shown, to receive the ends of the box or hub. The bolts 8 also serve to hold in place the wearplate, hereinafter described; The inner side of the part b of the hub is-provided transversely with a concave recess, which forms a seat for the shaft f, while the inner side of the other part of the hub is recessed to receive the wear-plate or metal casing c and wedge-piece d, the said recess being shaped to correspond with tho wear-plate, which fits the same closely. This wear-plate is shaped to form a curved wall 0 eccentric to the shaft .and joined at its outer end to a contiguous straight wall 0 which forms an abutment for the wide end of the wedge-plate. The end portions 0 of the wear-plate are pierced for the passage of the bolts 8, hereinbefore referred to. It will be noted that the curved wall of the wear-plate forms a tapering recess around one side of the shaft and that the wider end of said recess iscontracted by the straight wall 0 In this tapered recess fits the curved wedge-piece d, forminga lockingkey by which the pulleyis securely attached to the shaft. The concave surface of this wedge-piece or .key is providedwith teeth d to insure the proper engagement with the shaft. i i

The rim of-the pulley is split or divided into two parts, each having a spoke arm ct, so that the pulley may be separated in placing the same upon the shaft. When the parts are assembled upon the shaftand connected by the bolts, as shown in the drawings, the turning of the shaft inthe direction indicated by the arrow willicarry the key into' the smaller end of the tapered recess and wedge it tightly, locking the parts firmly together, so that the pulley will rotate with the shaft. When it is desired to move the pulley to another location on the shaft, it is only necessary to turn the pulley backward, which will loosen the key or wedge and permit the pulley to be slid along the shaft, and when the shaft is again started the pulley will be autom atically locked in; engagement therewith.

The devices herein shown and described provide a very simple and effective means for attaching a split pulley to a shaft, and as the parts are positive in their operation there is no chance of the pulley becoming loose upon the shaft. l

The straight wall 0 forms a contracted space at the wider end of the-tapered recess, in which the wedge or key works, so that the movement of the wedge is limitedin this direction, and also toprovide a space in which a tool may be inserted to force the wedge into the narrow end of the recess in case it is not moved by the shaft.

Having thus described my invention, I clairn In a split pulley, the combination with the segment-rims a a provided with-cross-arms or spokes a each havinga recess at its inner side, of the two-part box or hub fitting between the arms in the recesses thereof and having registering bolt-holes, said parts also having transverse recesses in their contiguous sides for the shaft and one of the parts further recessed centrally, a metal casing seated in the said central recess and provided with an eccentrically-curved wall terminating at one end in a straight wall, said casing being also provided with a flange projecting from the open end thereof and provided with holes HOSEA W. FINCII.

Witnesses:

E. E. WHITE, PETER DAVID. 

